WO1997041642A1 - Transmitter combiner arrangement - Google Patents

Transmitter combiner arrangement Download PDF

Info

Publication number
WO1997041642A1
WO1997041642A1 PCT/SE1997/000497 SE9700497W WO9741642A1 WO 1997041642 A1 WO1997041642 A1 WO 1997041642A1 SE 9700497 W SE9700497 W SE 9700497W WO 9741642 A1 WO9741642 A1 WO 9741642A1
Authority
WO
WIPO (PCT)
Prior art keywords
single carrier
transmitter
carrier power
power amplifier
amplifier
Prior art date
Application number
PCT/SE1997/000497
Other languages
French (fr)
Inventor
Torbjörn JOHNSON
Jens Malmgren
Original Assignee
Radio Design Innovation Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Radio Design Innovation Ab filed Critical Radio Design Innovation Ab
Priority to EP97914741A priority Critical patent/EP0956648A1/en
Priority to JP9538777A priority patent/JP2000509229A/en
Priority to AU21875/97A priority patent/AU2187597A/en
Publication of WO1997041642A1 publication Critical patent/WO1997041642A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0483—Transmitters with multiple parallel paths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0277—Selecting one or more amplifiers from a plurality of amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/211—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0088—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using discontinuously variable devices, e.g. switch-operated
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/72—Indexing scheme relating to gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal
    • H03F2203/7239—Indexing scheme relating to gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal the gated amplifier being switched on or off by putting into parallel or not, by choosing between amplifiers and shunting lines by one or more switch(es)

Definitions

  • the present invention relates to a transmitter combiner arrangement, and more specifically a transmitter combiner arrangement usable in a base station of a multilobe telecom- munication system having phased array antennas.
  • the invention is not limited to such a system, but is very use ⁇ ful with systems having a large dynamic range, e.g. up to 110 dB or more.
  • the transmitter arrangement according to the invention enables amplification of low and high levels with high efficiency by means of a hybride arrangement combining efficient single carrier power amplifiers (SCPA) and high power multicarrier power amplifiers (MCPA) .
  • SCPA single carrier power amplifier
  • MCPA high power multicarrier power amplifiers
  • the multicarrier power amplifier is a known amplifying circuit having high power but low efficiency.
  • the advantage of this circuit is that it may accomodate many channels.
  • the present invention provides a transmitter combiner arrangement comprising a hybride of progressively coupled single carrier power amplifiers and a multicarrier power amplifier connected with a combiner network.
  • Figure 1 is a block diagram of a first embodiment of the invention including progressively coupled single carrier power amplifiers and a multicarrier power amplifier con ⁇ nected by a combiner network;
  • Figure 2 is a block diagram of another embodiment of the invention in which single carrier power amplifiers are connected by a filter bank;
  • Figure 3 is a block diagram of a further embodiment- of the invention in which single carrier power amplifiers are connected by the filter bank and a 3 dB combiner;
  • Figure 4A is a block diagram of a preferred embodiment of a single carrier power amplifier according to the inven- tion.
  • Figure 4B is a block diagram of a possible implementa ⁇ tion of a single carrier power amplifier.
  • the transmitter combiner arrangement according to the present invention is suitable for use in communication systems that transmit signals with a wide dynamic range.
  • the power is distributed to many radiating elements, and in order to obtain low sidelobe levels, the power sent to the different radiating elements may vary 30 dB .
  • the base station includes a lobe-shaping unit for con ⁇ trolling the signals to the phased array antenna.
  • a base station controller in turn controls the base stations of the telecommunication system.
  • the lobe-shaping unit and the base station controller do not form any parts of the present in- vention.
  • the transmitter arrangement includes a number of SCPAs connected by transmitter combiner circuits WILKD3DB, which may be of the conventional Wilkin- son 3dB type, in a step arrangement having equal attenuation steps.
  • WILKD3DB transmitter combiner circuits
  • the top SCPA will be able to furnish the lowest output power.
  • the SCPAs In front of the SCPAs are variable attenuators WA.
  • the inputs to the various SCPAs are arranged according to the input level or power requirement, such that the correct output power is obtained at the. output.
  • At the top transmitter combiner is a further expansion input for additional low power channels.
  • the transmitter arrangement also comprises a multi- carrier power amplifier.
  • a combiner network In front of the MCPAs is a combiner network, which may consist of transmitter combiners or a resistive combiner network.
  • the combiner network is pre ⁇ ferably symmetrical, such that the gain through the ampli ⁇ bombs is the same independent of input port.
  • the MCPA is suitable for amplifying many low levels since these will not generate important intermodulation products.
  • the SCPAs and the MCPA are combined in a final trans ⁇ mitter combiner.
  • the control unit controls the various amplifier units of the SCPAs and the MCPA by pro- viding the correct input voltage and input currents, i.e. the bias of the amplifier units. Thus the efficiency of the amplifiers can be optimised.
  • the control unit also receives input information from a base site controller and a lobe- shaping unit, if the transmitter combiner arrangement according to the invention forms part of such a telecommu ⁇ nication system.
  • FIG 2 is shown another embodiment of the present invention.
  • the SCPAs are connected by a filter bank to the final transmitter combinex.
  • the filters of the filter bank are connected by ⁇ /4 and ⁇ /2 transmission lines to the combiner for correct addition at the combiner.
  • FIG 3 is shown an embodiment of the invention featuring only SCPAs combined with filters. This embodiment is useful when it is desired to amplify many similar high level signals. It is especially advantageous with a pre ⁇ ferred embodiment of a single carrier power amplifier according to the present invention as described below with reference to Figures 4A and B.
  • Figure 4A is shown an especially advantageous form of a single carrier power amplifier having variable power and amplification levels.
  • the amplifier comprises a number of amplifier units AMP which may be en ⁇ abled by setting a corresponding number of switches.
  • the amplifier unit at the far left can only output low signal levels.
  • the middle amplifier is also enabled as it can supply medium output " levels.
  • the amplifier unit at the far right is enabled being able to supply high output levels.
  • the middle or right-hand amplifiers are disabled, their biases are turned off so that the power consumption is considerably reduced and the signal is by ⁇ passed.
  • the efficiency of the amplifier is maintained fairly independent of the output signal level.
  • the amplifier arrangement achieves 60 dB gain control. This is achieved by varying the bias of the amplifiers.
  • a voltage variable attenuator WA is used to fine tune the gain.
  • Figure 4B shows a possible implementation of the amplifier circuit including switchable PIN diodes and ⁇ /4 transmission lines MTRL.

Abstract

The invention relates to a transmitter combiner arrangement, and more specifically a transmitter combiner arrangement usable in communication systems transmitting signals with a wide dynamic range, e.g. in a base station of a multilobe telecommunication system having phased array antennas. The transmitter arrangement according to the invention enables amplification of low and high levels with high efficiency by means of a hybride arrangement comprising a hybride of progressively coupled single carrier power amplifiers (SCPA) and a multicarrier power amplifier (MCPA) connected with a combiner network.

Description

TITLE OF INVENTION: TRANSMITTER COMBINER ARRANGEMENT
FIELD OF THE INVENTION
The present invention relates to a transmitter combiner arrangement, and more specifically a transmitter combiner arrangement usable in a base station of a multilobe telecom- munication system having phased array antennas. However, the invention is not limited to such a system, but is very use¬ ful with systems having a large dynamic range, e.g. up to 110 dB or more. The transmitter arrangement according to the invention enables amplification of low and high levels with high efficiency by means of a hybride arrangement combining efficient single carrier power amplifiers (SCPA) and high power multicarrier power amplifiers (MCPA) .
STATE OF THF, ART Single carrier power amplifiers are known amplifier circuits having high efficiency at maximum output power but are, of course, used for only one carrier frequency at a time. Today it is conventional to combine such SCPAs with filter combiners. It is also conventional to use SCPAs with 3 dB combiners. However, power is lost in the combiner re¬ sulting in low efficiency and high current consumption, which means high costs .
The multicarrier power amplifier is a known amplifying circuit having high power but low efficiency. The advantage of this circuit is that it may accomodate many channels.
However, they are expensive and difficult to implement when different carriers are at different levels, such as when power control is used or in phased array antennas.
The problems stated above are solved by the present invention by using single carrier power amplifiers in a progressive coupling, which enhances efficiency compared to a 3 dB combiner amplifier. This is combined with a multi- carrier power amplifier for lower power carriers. This re¬ duces costs significantly compared to high power MCPA. For enhanced capacity the invention features an expansion input.
SUMMARY OF THE INVENTION
Thus, the present invention provides a transmitter combiner arrangement comprising a hybride of progressively coupled single carrier power amplifiers and a multicarrier power amplifier connected with a combiner network.
The invention is set forth in detail in the accompanying claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described below with reference to the accompanying drawings, in which
Figure 1 is a block diagram of a first embodiment of the invention including progressively coupled single carrier power amplifiers and a multicarrier power amplifier con¬ nected by a combiner network;
Figure 2 is a block diagram of another embodiment of the invention in which single carrier power amplifiers are connected by a filter bank; Figure 3 is a block diagram of a further embodiment- of the invention in which single carrier power amplifiers are connected by the filter bank and a 3 dB combiner;
Figure 4A is a block diagram of a preferred embodiment of a single carrier power amplifier according to the inven- tion; and
Figure 4B is a block diagram of a possible implementa¬ tion of a single carrier power amplifier.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS As is mentioned above, the transmitter combiner arrangement according to the present invention is suitable for use in communication systems that transmit signals with a wide dynamic range. In a multilobe system with a phased array antenna, the power is distributed to many radiating elements, and in order to obtain low sidelobe levels, the power sent to the different radiating elements may vary 30 dB . In a base station, it is also desirable to use power control in order not to send out more power than necessary, the usable power being about 80 dB. This leads to a require- ment for dynamic range of 110 dB. As the requirement for suppression of intermodulation is 60-70 dB depending on the application, the requirement for intermodulation product suppression with this dynamic range is 170-180 dB, which is not achievable with an ordinary MCPA. The base station includes a lobe-shaping unit for con¬ trolling the signals to the phased array antenna. A base station controller in turn controls the base stations of the telecommunication system. The lobe-shaping unit and the base station controller do not form any parts of the present in- vention.
In Figure 1 is shown a preferred embodiment of the pre¬ sent invention. As may be seen the transmitter arrangement includes a number of SCPAs connected by transmitter combiner circuits WILKD3DB, which may be of the conventional Wilkin- son 3dB type, in a step arrangement having equal attenuation steps. Thus, the top SCPA will be able to furnish the lowest output power. In front of the SCPAs are variable attenuators WA. The inputs to the various SCPAs are arranged according to the input level or power requirement, such that the correct output power is obtained at the. output.
At the top transmitter combiner is a further expansion input for additional low power channels.
The transmitter arrangement also comprises a multi- carrier power amplifier. In front of the MCPAs is a combiner network, which may consist of transmitter combiners or a resistive combiner network. The combiner network is pre¬ ferably symmetrical, such that the gain through the ampli¬ fiers is the same independent of input port. The MCPA is suitable for amplifying many low levels since these will not generate important intermodulation products.
The SCPAs and the MCPA are combined in a final trans¬ mitter combiner.
At the output of the MCPA is a detector for providing information to a control unit. The control unit controls the various amplifier units of the SCPAs and the MCPA by pro- viding the correct input voltage and input currents, i.e. the bias of the amplifier units. Thus the efficiency of the amplifiers can be optimised. The control unit also receives input information from a base site controller and a lobe- shaping unit, if the transmitter combiner arrangement according to the invention forms part of such a telecommu¬ nication system.
In Figure 2 is shown another embodiment of the present invention. In this embodiment the SCPAs are connected by a filter bank to the final transmitter combinex. The filters of the filter bank are connected by λ/4 and λ/2 transmission lines to the combiner for correct addition at the combiner.
In Figure 3 is shown an embodiment of the invention featuring only SCPAs combined with filters. This embodiment is useful when it is desired to amplify many similar high level signals. It is especially advantageous with a pre¬ ferred embodiment of a single carrier power amplifier according to the present invention as described below with reference to Figures 4A and B. In Figure 4A is shown an especially advantageous form of a single carrier power amplifier having variable power and amplification levels. As may be seen, the amplifier comprises a number of amplifier units AMP which may be en¬ abled by setting a corresponding number of switches. The amplifier unit at the far left can only output low signal levels. When a higher signal levels are required, the middle amplifier is also enabled as it can supply medium output "levels. At high output levels, also the amplifier unit at the far right is enabled being able to supply high output levels. When the middle or right-hand amplifiers are disabled, their biases are turned off so that the power consumption is considerably reduced and the signal is by¬ passed. With this arrangement, the efficiency of the amplifier is maintained fairly independent of the output signal level. Also, the amplifier arrangement achieves 60 dB gain control. This is achieved by varying the bias of the amplifiers. A voltage variable attenuator WA is used to fine tune the gain.
Figure 4B shows a possible implementation of the amplifier circuit including switchable PIN diodes and λ/4 transmission lines MTRL.
The present invention has been described with reference to the disclosed embodiments in great detail. However, many variations and modifications of the embodiments may be app¬ reciated by a person skilled in the art. The invention is only restricted by the scope of the claims below.

Claims

1. A transmitter combiner arrangement, characterised by a hybrid of progressively coupled single carrier power amplifiers (SCPA) and a multicarrier power amplifier (MCPA) connected with a combiner network.
2. A transmitter combiner arrangement according to claim 1, characterised in that the single carrier power amplifiers are coupled in equal steps by transmitter combin¬ ers, e.g. of Wilkinson type.
3. A transmitter combiner arrangement according to claim 1 or 2, characterised in that the combiner network of the multicarrier power amplifier is symmetrical for equal amplification of the multicarrier power amplifier channels.
4. A transmitter combiner arrangement according to any one of claims 1 to 3 , characterised by having an expansion input for adding more single carrier power amplifiers .
5. A transmitter combiner arrangement according to any one of the preceding claims, characterised by a control unit receiving information from a detector connected to the out- puts of the single carrier power amplifiers and the multi- carrier power amplifier for controlling the bias of the amplifier units of the single carrier power amplifiers and the multicarrier power amplifier.
6. A transmitter combiner arrangement according to claim 5, characterised in that the control unit receives information from a base site controller (BSC) and/or a lobe shaping unit of a multilobe telecommunication system.
7. A transmitter combiner arrangement, characterised by a hybrid of single carrier power amplifiers (SCPA) coupled by a filter bank and a multicarrier power amplifier (MCPA) connected with a combiner network.
8. A single carrier power amplifier, characterised by an assembly of a plurality of amplifier units having a high efficiency for varying input levels, wherein the amplifier units are enabled progressively by switches for varying output powers .
9. A single carrier power amplifier according to claim 8, characterised in that the switches of the amplifier circuit include switchable PIN diodes and λ/4 transmission lines (MTRL) .
10. A transmitter combiner arrangement according to any one of claims 1 to 7, characterised by a single carrier power amplifier according to claims 8 or 9.
PCT/SE1997/000497 1996-04-29 1997-03-24 Transmitter combiner arrangement WO1997041642A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP97914741A EP0956648A1 (en) 1996-04-29 1997-03-24 Transmitter combiner arrangement
JP9538777A JP2000509229A (en) 1996-04-29 1997-03-24 Transmitter coupler arrangement
AU21875/97A AU2187597A (en) 1996-04-29 1997-03-24 Transmitter combiner arrangement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9601619-1 1996-04-29
SE9601619A SE9601619L (en) 1996-04-29 1996-04-29 Device with transmitter combiner

Publications (1)

Publication Number Publication Date
WO1997041642A1 true WO1997041642A1 (en) 1997-11-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (5)

Country Link
EP (1) EP0956648A1 (en)
JP (1) JP2000509229A (en)
AU (1) AU2187597A (en)
SE (1) SE9601619L (en)
WO (1) WO1997041642A1 (en)

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EP0933879A2 (en) * 1998-02-03 1999-08-04 Rohde & Schwarz GmbH & Co. KG Radio frequency transmitter
WO1999046854A1 (en) * 1998-03-12 1999-09-16 Sentel Corporation A comb linear amplifier combiner (clac)
EP0961402A2 (en) * 1998-05-27 1999-12-01 Nokia Mobile Phones Ltd. A transmitter
EP0977354A1 (en) * 1998-02-19 2000-02-02 Ntt Mobile Communications Network Inc. Amplifier for radio transmission
EP0987817A1 (en) * 1998-09-16 2000-03-22 Lucent Technologies Inc. Method and apparatus for improving efficiency of high-power linear amplifier
EP0998033A1 (en) * 1998-05-14 2000-05-03 Mitsubishi Denki Kabushiki Kaisha Semiconductor circuit
EP1100147A2 (en) * 1999-11-10 2001-05-16 Lucent Technologies Inc. Power amplifier system for an antenna system
WO2001043469A1 (en) * 1999-12-10 2001-06-14 Nokia Corporation An antenna system
WO2001056171A2 (en) * 2000-01-25 2001-08-02 Paradigm Wireless Communications, Llc Switch assembly with a multi-pole switch for combining amplified rf signals to a single rf signal
WO2001059923A2 (en) * 2000-02-08 2001-08-16 Wireless Systems International Limited Amplifier arrangement
EP1182786A1 (en) * 2000-08-21 2002-02-27 Lucent Technologies Inc. Transmission and reception device for base stations
FR2816132A1 (en) * 2000-10-31 2002-05-03 Agence Spatiale Europeenne Reconfigurable device for amplifying radio-frequency signals, comprising power divider, amplifier set and power combiner, controlled by measuring input and output powers
WO2002052723A2 (en) * 2000-12-22 2002-07-04 The Johns Hopkins University High-efficiency solid state power amplifier
WO2003063370A1 (en) * 2002-01-25 2003-07-31 Siemens Aktiengesellschaft Method and device for generating a high frequency multiple carrier signal
EP1425851A1 (en) * 2001-08-17 2004-06-09 Harris Corporation Broadband amplifier system having improved linearity and minimum loss
US7647030B2 (en) 2004-10-22 2010-01-12 Parkervision, Inc. Multiple input single output (MISO) amplifier with circuit branch output tracking
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US8913691B2 (en) 2006-08-24 2014-12-16 Parkervision, Inc. Controlling output power of multiple-input single-output (MISO) device
US9094085B2 (en) 2005-10-24 2015-07-28 Parkervision, Inc. Control of MISO node
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EP0933879A2 (en) * 1998-02-03 1999-08-04 Rohde & Schwarz GmbH & Co. KG Radio frequency transmitter
EP0933879A3 (en) * 1998-02-03 2000-06-07 Rohde & Schwarz GmbH & Co. KG Radio frequency transmitter
EP0977354A1 (en) * 1998-02-19 2000-02-02 Ntt Mobile Communications Network Inc. Amplifier for radio transmission
US6265935B1 (en) 1998-02-19 2001-07-24 Ntt Mobile Communications Network Inc. Amplifier for radio transmission
EP0977354A4 (en) * 1998-02-19 2001-03-07 Nippon Telegraph & Telephone Amplifier for radio transmission
US6211732B1 (en) 1998-03-12 2001-04-03 Sentel Corporation Comb linear amplifier combiner (CLAC)
WO1999046854A1 (en) * 1998-03-12 1999-09-16 Sentel Corporation A comb linear amplifier combiner (clac)
EP0998033A4 (en) * 1998-05-14 2004-07-07 Mitsubishi Electric Corp Semiconductor circuit
EP0998033A1 (en) * 1998-05-14 2000-05-03 Mitsubishi Denki Kabushiki Kaisha Semiconductor circuit
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EP0961402A3 (en) * 1998-05-27 2001-01-03 Nokia Mobile Phones Ltd. A transmitter
EP0961402A2 (en) * 1998-05-27 1999-12-01 Nokia Mobile Phones Ltd. A transmitter
EP0987817A1 (en) * 1998-09-16 2000-03-22 Lucent Technologies Inc. Method and apparatus for improving efficiency of high-power linear amplifier
US6418304B1 (en) 1998-09-16 2002-07-09 Lucent Technologies Inc. Method and apparatus for improving efficiency of high-power linear amplifier
EP1100147A3 (en) * 1999-11-10 2003-11-26 Lucent Technologies Inc. Power amplifier system for an antenna system
EP1100147A2 (en) * 1999-11-10 2001-05-16 Lucent Technologies Inc. Power amplifier system for an antenna system
JP2007116745A (en) * 1999-11-10 2007-05-10 Lucent Technol Inc Power amplifier system
KR100767885B1 (en) * 1999-11-10 2007-10-17 루센트 테크놀러지스 인크 Power amplifier system
US7019710B1 (en) 1999-12-10 2006-03-28 Nokia Corporation Antenna system
WO2001043469A1 (en) * 1999-12-10 2001-06-14 Nokia Corporation An antenna system
WO2001056171A3 (en) * 2000-01-25 2002-04-11 Paradigm Wireless Communicatio Switch assembly with a multi-pole switch for combining amplified rf signals to a single rf signal
WO2001056171A2 (en) * 2000-01-25 2001-08-02 Paradigm Wireless Communications, Llc Switch assembly with a multi-pole switch for combining amplified rf signals to a single rf signal
US6587014B2 (en) 2000-01-25 2003-07-01 Paradigm Wireless Communications Llc Switch assembly with a multi-pole switch for combining amplified RF signals to a single RF signal
WO2001059923A2 (en) * 2000-02-08 2001-08-16 Wireless Systems International Limited Amplifier arrangement
US6819171B2 (en) 2000-02-08 2004-11-16 Andrew Corporation Amplifier arrangement
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JP2000509229A (en) 2000-07-18
SE9601619D0 (en) 1996-04-29
AU2187597A (en) 1997-11-19
SE9601619L (en) 1997-10-30
EP0956648A1 (en) 1999-11-17

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